Is there any data on packet duplication?
hgm+nanog at ip-64-139-1-69.sjc.megapath.net
Tue Jun 23 00:28:40 UTC 2020
How often do packets magically get duplicated within the network so that the
target receives 2 copies? That seems like something somebody at NANOG might
have studied and given a talk on.
Any suggestions for other places to look?
Context is NTP. If a client gets an answer, should it keep the socket around
for a short time so that any late responses or duplicates from the network
don't turn into ICMP port unreachable back at the server. Nothing critical,
just general clutter reduction.
I have packet captures from a NTP server. I'm trying to sort things out.
There are a surprising (to me) number of duplicates that arrive back-to-back,
sometimes the timestamp is the same microsecond. They could come from buggy
clients, but that seems like an unlikely sort of bug.
These are my opinions. I hate spam.
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